[SQL]가격대 별 상품 개수 구하기

https://school.programmers.co.kr/learn/courses/30/lessons/131530

프로그래머스

SELECT
    case when price < 10000 then 0
        else (floor(price/10000)*10000)
        end as price_group
    , count(distinct product_id) products
from product
group by 1
order by 1